package juc.demo2;

import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;

public class classMainClass {
    public static void main(String[] args) throws Exception {

        FileManager a = new FileManager("a.txt", new char[]{'\n'});

        FileManager b = new FileManager("b.txt", new char[]{'\n', ' '});

        FileWriter c = new FileWriter("c.txt");

        String aWord = null;

        String bWord = null;

        while ((aWord = a.nextWord()) != null) {

            c.write(aWord + "\n");

            bWord = b.nextWord();

            if (bWord != null)

                c.write(bWord + "\n");

        }


        while ((bWord = b.nextWord()) != null) {

            c.write(bWord + "\n");

        }

        c.close();

    }


}


class FileManager {


    String[] words = null;

    int pos = 0;

    public FileManager(String filename, char[] seperators) throws Exception {

        File f = new File(filename);

        FileReader reader = new FileReader(f);

        char[] buf = new char[(int) f.length()];

        int len = reader.read(buf);

        String results = new String(buf, 0, len);

        String regex = null;

        if (seperators.length > 1) {

            regex = "" + seperators[0] + "|" + seperators[1];

        } else {

            regex = "" + seperators[0];

        }

        words = results.split(regex);
        for (int i = 0; i < words.length; i++) {
            System.out.println(words[i]);
        }

    }


    public String nextWord() {

        if (pos == words.length)

            return null;

        return words[pos++];

    }


}
